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ST Microelectronics - FUNCTION LOOK AHEAD CARRY GENERATOR

Numéro de référence M54HC182F1R
Description FUNCTION LOOK AHEAD CARRY GENERATOR
Fabricant ST Microelectronics 
Logo ST Microelectronics 





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M54HC182F1R fiche technique
M54HC182
M74HC182
FUNCTION LOOK AHEAD CARRY GENERATOR
. HIGH SPEED
tPD = 14 ns (TYP.) at VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) at TA = 25 °C
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH= IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V to 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS182
DESCRIPTION
The M54/74HC182 is a high speed CMOS FUNC-
TION LOOK AHEAD CARRY GENERATOR
fabricated in silicon gate C2MOS technology. It has
the same high speed performance of LSTTL com-
bined with true CMOS low power consumption.
These circuit are capable of anticipating a carry
across four binary adders or group of adders. They
are cascadable to perform full look-ahead across n-
bit adders. Carry, generate-carry, and
propagate-carry functions are provided as shown in
the pin connection table. When used in conjunction
with the HC181 arithmetic logic unit, these gener-
ators provide high-speed carry look-ahead
capability for any word length. Each HC182 gener-
ates the look-ahead (anticipated carry) across a
group of four ALU’s and, in addition, other carry look-
ahead circuits may be employed to anticipate carry
across sections of four look-ahead packages up to
n-bits. The method of cascading circuits to perform
multi-level look-ahead is illustrated under typical ap-
plication data.
Carry input and output of the ALUs are in their true
form, and the carry propagate (P) and carry gener-
ate (G) are in negated form ; therefore, the carry
functions (inputs, outputs, generate, and propagate)
of the look-ahead generators are implemented in
the compatible forms for direct connection to the
ALU. Reinterpretation of carry functions as ex-
plained on the HC181 data sheet are also applicable
to and compatible with the look-ahead generator. All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 18 2F 1R
M 74H C1 82 M1 R
M 74HC 18 2B 1R
M 74H C1 82 C1 R
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
March 1993
1/12

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